2025-01-29 ペンシルベニア州立大学 (PennState)
<関連情報>
- https://www.psu.edu/news/eberly-college-science/story/materials-can-remember-sequence-events-unexpected-way
- https://www.science.org/doi/10.1126/sciadv.adr5933
単一ドライブから複数のメモリを一般化する ヒステロンラッチ Generalizing multiple memories from a single drive: The hysteron latch
Chloe W. Lindeman, Travis R. Jalowiec, and Nathan C. Keim
Science Advances Published:29 Jan 2025
Abstract
Far-from-equilibrium systems can form memories of previous deformations or driving. In systems from sheared glassy materials to buckling beams to crumpled sheets, this behavior is dominated by return-point memory, in which revisiting a past extremum of driving restores the system to a previous state. Cyclic driving with both positive and negative strains forms multiple nested memories, as in a single-dial combination lock, while asymmetric driving (only positive strain) cannot. We study this case in a general model of hysteresis that considers discrete elements called hysterons. We show how two hysterons with a frustrated interaction can violate return-point memory, realizing multiple memories of asymmetric driving. This reveals a general principle for designing systems that store sequences of cyclic driving, whether symmetric or asymmetric. In disordered systems, asymmetric driving is a sensitive tool for the direct measurement of frustration.